US3726427A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lift trucks
Assignee: BYGG OCH TRANSPORTEKONOMI SW AB
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Filing: 1971-08-25
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Granted: 1973-04-10
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Expires: 1991-08-25
Abstract
Abstract A lift truck having a mast, a load carriage for movement up and down said mast and provided with forks which are rotatably mounted in said load carriage about a horizontal, transversal shaft. The load carriage and the forks are each provided with a supporting surface, said surfaces converging against each other. Hydraulic means cause two rollers to move between the two supporting surfaces in the converging and diverging direction thereof to rotate the forks in either direction round its horizontal shaft. The rollers are freely rotatable in relation to each other, the one for engagement with only one supporting surface and the other with only the other supporting surface.
Inventors
- 👤 R Carlund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:53
CPC Classifications
B; B66; B66F; B66F9/00; B66F9/06; B66F9/075; B66F9/12; B66F9/16
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
184 words
A lift truck comprising an upwardly extending mast, a load carriage positioned on said mast for movement in the up and down direction, a horizontal transversal shaft mounted on said load carriage, forks rotatively mounted on said shaft, hydraulic means in engagement with said shaft and arranged for rotating said forks about said shaft, a movable coupling member operatively engaged with said hydraulic means, a pair of oppositely arranged supporting surfaces, one of which is on the load carriage and the other of which is on the forks, said two surfaces converging toward each other, at least two rollers freely rotatable relative to one another, said rollers mounted on said movable member and one of said rollers is in engagement with only one of said supporting surfaces and the other said roller is in engagement with only the other said supporting surface so that when said movable member is moved by said hydraulic means said rollers contacting said surface causes the surface of said forks to move to and from the surface of said load carriage and rotates said forks about said horizontal shaft.
Claim 2
Dependent Claim
184 words
A lift truck comprising an upwardly extending mast, a load carriage positioned on said mast for movement in the up and down direction, a horizontal transversal shaft mounted on said load carriage, forks rotatively mounted on said shaft, hydraulic means in engagement with said shaft and arranged for rotating said forks about said shaft, a movable coupling member operatively engaged with said hydraulic means, a pair of oppositely arranged supporting surfaces, one of which is on the load carriage and the other of which is on the forks, said two surfaces converging toward each other, at least two rollers freely rotatable relative to one another, said rollers mounted on said movable member and one of said rollers is in engagement with only one of said supporting surfaces and the other said roller is in engagement with only the other said supporting surface so that when said movable member is moved by said hydraulic means said rollers contacting said surface causes the surface of said forks to move to and from the surface of said load carriage and rotates said forks about said horizontal shaft.
Claim 3
Dependent Claim
52 words
A lift truck, as set forth in claim 1, wherein said hydraulic means includes a cylinder which depends downwardly from said horizontal shaft, said movable member includes a piston-rod attached to the lower end of said cylinder, and said supporting surfaces are arranged to converge toward one another in the downward direction.
Claim 4
Dependent Claim
163 words
A lift truck, as set forth in claim 2, wherein said one of said supporting surfaces is secured on said forks, said one of said supporting surfaces is relatively wide and is positioned substantially vertically, said other one of said supporting surfaces is secured in said load carriage and is inclined relative to the one of said support surfaces, said other one of said support surfaces is narrower than said one of said support surfaces, said rollers comprise two outer rollers and an intermediate roller positioned between said outer rollers, said two outer rollers arranged to engage said one of said supporting surfaces, a shaft secured to and extending transversely of said piston-rod, said two outer rollers rotatively mounted on said shaft on said piston-rod, said intermediate roller rotatively mouNted on said shaft on said piston-rod and having a diameter smaller than that of said two outer rollers, and said intermediate roller being arranged to engage the other one of said supporting surfaces.
References Cited (Backward Citations)
US3083853A
Cited
US3532239A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |